Trump impeachment: Lindsey Graham to give president's lawyer platform in Senate for widely debunked Ukraine conspiracy theory

Lindsey Graham has invited Donald Trump's personal attorney, Rudy Giuliani, to testify before the Senate, citing an interest in providing a counterweight to the impeachment inquiry being run by House Democrats.

The invitation was announced Tuesday on Twitter by the South Carolina Republican, with a message in which he appears to reference unfounded allegations made by the president that Joe Biden used his clout as vice president to pressure the Ukrainian government to fire former prosecutor general Viktor Shokin.

"Given the House of Representatives' behaviour, it is time for the Senate to enquire about corruption and other improprieties involving Ukraine," Mr Graham wrote.

He continued: "Therefore I will offer to Mr Giuliani the opportunity to come before the Senate Judiciary Committee to inform the committee of his concerns."

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